<template>
    <div>
        <!-- 面包屑导航 -->
        <el-breadcrumb separator-class="el-icon-arrow-right">
  <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
  <el-breadcrumb-item>商品管理</el-breadcrumb-item>
  <el-breadcrumb-item>参数列表</el-breadcrumb-item>
     </el-breadcrumb>
<!-- 卡片视图 -->
<el-card>
    <!-- 头部的警告区域 -->
    <el-alert
     title="注意：只允许为第三季分类设置相关参数！"
     type="warning"
     :closable="false"
     show-icon>
  </el-alert>
<!--选择商品分类区域 -->
<el-row class="cat_opt">
    <el-col>
        <span>选择商品分类：</span>
         <!-- 选择商品分类的级联选择框，在新版element-ui中会出现溢出问题，只要在global.css中加入样式限制即可-->
     <el-cascader
    v-model="selectedKeys"
    :options="catelist"
    :props="cateProps"
    expandTrigger = "hover"
    @change="handleChange">
    </el-cascader>
    </el-col>
   
  
</el-row>

<!-- tab页签区域 -->
<el-tabs v-model="activeName" @tab-click="handleTabClick">
    <!-- 添加动态参数的面板 -->
    <el-tab-pane label="动态参数" name="many">
        <!-- 添加参数的按钮 -->
        <el-button type="primary" size="mini" :disabled="isBtnDisable" @click="addDialogVisible=true">添加参数</el-button>
        <!-- 动态参数的表格 -->
        <el-table :data=" manyTableData" border stripe>
            <!-- 展开行 -->
            <el-table-column type="expand">
                <template slot-scope="scope">
                    <!-- 循环渲染tag标签 -->
                      <el-tag v-for="(item,i) in scope.row.attr_vals" :key="i" closable @close="handleClose(i,scope.row)">{{item}}</el-tag> 
                      <!-- 输入文本框 -->
                      <el-input
                       class="input-new-tag"
                       v-if="scope.row.inputVisible"
                       v-model="scope.row.inputValue"
                       ref="saveTagInput"
                       size="small"
                       @keyup.enter.native="handleInputConfirm(scope.row)"
                       @blur="handleInputConfirm(scope.row)"
                      >
                        </el-input>
                           <!-- 添加的按钮 -->
                          <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>
                </template>
            </el-table-column>
             <!-- 索引列 -->
            <el-table-column type="index"></el-table-column>
            <el-table-column label="参数名称" prop="attr_name"></el-table-column>
            <el-table-column label="操作">
                <template slot-scope="scope">
                <el-button size="mini" type="primary" icon="el-icon-edit" @click="showEditDialog(scope.row.attr_id)">编辑</el-button>
                <el-button  size="mini" type="danger" icon="el-icon-delete" @click="removeParams(scope.row.attr_id)">删除</el-button>
                </template>
            </el-table-column>
        </el-table>
    </el-tab-pane>
    <!-- 添加静态属性的面板 -->
    <el-tab-pane label="静态属性" name="only">
        <!-- 添加属性的按钮 -->
         <el-button type="primary" size="mini" :disabled="isBtnDisable" @click="addDialogVisible=true">添加属性</el-button>
         <!-- 静态属性表格 -->
         <el-table :data="onlyTableData" border stripe>
            <!-- 展开行 -->
           <el-table-column type="expand">
                <template slot-scope="scope">
                    <!-- 循环渲染tag标签 -->
                      <el-tag v-for="(item,i) in scope.row.attr_vals" :key="i" closable @close="handleClose(i,scope.row)">{{item}}</el-tag> 
                      <!-- 输入文本框 -->
                      <el-input
                       class="input-new-tag"
                       v-if="scope.row.inputVisible"
                       v-model="scope.row.inputValue"
                       ref="saveTagInput"
                       size="small"
                       @keyup.enter.native="handleInputConfirm(scope.row)"
                       @blur="handleInputConfirm(scope.row)"
                      >
                        </el-input>
                           <!-- 添加的按钮 -->
                          <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>
                </template>
            </el-table-column>
             <!-- 索引列 -->
            <el-table-column type="index"></el-table-column>
            <el-table-column label="属性名称" prop="attr_name"></el-table-column>
            <el-table-column label="操作">
                <template slot-scope="scope">
                <el-button size="mini" type="primary" icon="el-icon-edit"  @click="showEditDialog(scope.row.attr_id)">编辑</el-button>
                <el-button  size="mini" type="danger" icon="el-icon-delete" @click="removeParams(scope.row.attr_id)">删除</el-button>
                </template>
            </el-table-column>
        </el-table>
    </el-tab-pane>
  </el-tabs>
</el-card>
<!--  添加参数的对话框，两个公用一个对话框-->
<el-dialog
  :title="'添加'+dialogText"
  :visible.sync="addDialogVisible"
  width="50%"
  @close="addDialogClosed"
  >
  
  <el-form :model="addForm" :rules="addFormRules" ref="addFormRef" label-width="100px">
  <el-form-item :label="dialogText" prop="attr_name">
    <el-input v-model="addForm.attr_name"></el-input>
  </el-form-item>
  </el-form>

  <span slot="footer">
    <el-button type="danger" @click="addDialogVisible = false">取 消</el-button>
    <el-button type="primary" @click="addParams">确 定</el-button>
  </span>
</el-dialog>

<!-- 修改参数的对话框 -->
<el-dialog
  :title="'修改'+dialogText"
  :visible.sync="editDialogVisible"
  width="50%"
  @close="editDialogClosed"
  >
  
  <el-form :model="editForm" :rules="editFormRules" ref="editFormRef" label-width="100px">
  <el-form-item :label="dialogText" prop="attr_name">
    <el-input v-model="editForm.attr_name"></el-input>
  </el-form-item>
  </el-form>

  <span slot="footer">
    <el-button type="danger" @click="editDialogVisible = false">取 消</el-button>
    <el-button type="primary" @click="editParams">确 定</el-button>
  </span>
</el-dialog>
    </div>
</template>

<style lang="less" scoped>
.cat_opt{
    margin: 15px 0;
}
.el-tag{
   margin: 10px;
}
.input-new-tag{
    width: 120px;
}
</style>

<script>
export default {
    data(){
        return{
      //商品分类列表
            catelist:[],
            //级联选择框的配置对象
            cateProps:
                {
                    value:'cat_id',
                    label:'cat_name',
                    children:'children'
                },
            //级联选择框的双向绑定的数组
            selectedKeys:[],
            //被激活的页签名称
            activeName:'many',
            //动态参数
            manyTableData:[],
            //静态属性
            onlyTableData:[],
            //控制添加对话框显示与隐藏
            addDialogVisible:false,
            //添加参数的表单的数据对象
            addForm:{},
            //添加表单的验证规则
            addFormRules:{
                 attr_name:[{required:true,message:'请输入参数名称',trigger:'blur'}]  
            },

            //控制修改对话框的显示与隐藏
            editDialogVisible:false,
            //修改的表单的数据对象
            editForm:{},
            //修改的表单的验证规则对象
            editFormRules:{
                attr_name:[{required:true,message:'请输入参数名称',trigger:'blur'}]  
            },
           
        }
    },
    created(){
        //获取所有商品分类
     this.getCateList()
    },
    methods:{
    async getCateList() {
     const {data:res} = await this.$http.get('categories')
    if(res.meta.status!=200){
        return this.$message.error('获取商品分类失败');
    }
    this.$message.success('添加商品分类成功')
    this.catelist = res.data;
    console.log(this.catelist)
    },
    //级联选择框选中项变化，会触发这个函数
    handleChange(){
      this.getParamsData();
    },
    //tab页签点击事件的处理
       handleTabClick(){
           console.log(this.activeName)
           this.getParamsData();
       },
       //获取参数的列表数据,为了在以上两个操作中都能调用此函数
     async  getParamsData(){
       //证明选中的不是三级分类
        if(this.selectedKeys.length!=3){
            this.selectedKeys=[]
            this.manyTableData = []
            this.onlyTableData=[]
                return
         }
         //证明选中的是三级分类
         console.log("选中的是三级分类") 
         //根据所选的分类id和当前所处的面板，获取对应参数
     const {data:res} =  await this.$http.get(`categories/${this.cateID}/attributes`,{params:{sel:this.activeName}})
     if(res.meta.status!==200){
         return this.$message.error("获取参数列表失败")
     }
     

      res.data.forEach(item => {
          item.attr_vals=item.attr_vals?item.attr_vals.split(','):[]
          //控制文本框的显示与隐藏
          item.inputVisible = false
          //文本框中的输入值
          item.inputValue = ''
      });
    console.log(res.data)
     if(this.activeName=='many'){
         this.manyTableData = res.data;
     }else{
         this.onlyTableData = res.data;
     }
     this.$message.success("获取参数列表成功!")

          },
       //监听添加对话框的关闭事件
       addDialogClosed(){
          this.$refs.addFormRef.resetFields();
          console.log("已清除上次输入")
       },
       //点击添加按钮提交需要添加的数据,先预验证
        async addParams(){
          this.$refs.addFormRef.validate(async valid=>{
             if(!valid)return
         const {data:res} =  await  this.$http.post(`categories/${this.cateID}/attributes`,{attr_name:this.addForm.attr_name,attr_sel:this.activeName}) 
          if(res.meta.status!=201){
              return this.$message.error("此次添加请求失败")
          }
          this.$message.success("此次添加请求成功!") 
          this.addDialogVisible = false;
          this.getParamsData();
          })
         },
         //点击按钮展示修改的对话框
        async showEditDialog(attr_id){
             //查询当前参数的信息
        const {data:res} = await this.$http.get(`categories/${this.cateID}/attributes/${attr_id}`,{params:{attr_sel:this.activeName}})
            if(res.meta.status!=200){
                return  this.$message.error("获取参数信息失败")
            }
            this.editForm = res.data
            this.editDialogVisible = true

         },
         //重置修改的表单
         editDialogClosed(){
             this.$refs.editFormRef.resetFields();
         },
         //点击按钮修改对话框信息
         editParams(){
             this.$refs.editFormRef.validate(async valid =>{
               if(!valid)return 
               const {data:res} = await this.$http.put(`categories/${this.cateID}/attributes/${this.editForm.attr_id}`,{attr_name:this.editForm.attr_name,attr_sel:this.activeName})  
             if(res.meta.status!=200) {return this.$message.error("修改信息失败")}
              this.$message.success("修改参数成功啦")
              this.getParamsData();
            })
             this.editDialogVisible= false
         },
         //点击按钮根据attr_id删除属性
          async removeParams(attr_id){
        const confirmResult = await this.$confirm('此操作将永久删除该参数, 是否继续?', '提示',
         {
          confirmButtonText: '确定',
          cancelButtonText: '取消',
          type: 'warning'
        }).catch(err=>err)
            //用户取消了删除的操作
        if(confirmResult!=='confirm'){
            return this.$message.info('已取消删除')
        }
     const {data:res} = await this.$http.delete(`categories/${this.cateID}/attributes/${attr_id}`)
      if(res.meta.status!=200){
          return this.$message.error("删除参数失败!")
      }
         this.$message.success('删除参数成功!')
         this.getParamsData()
             },
             //文本框失去焦点或者点击回车键都会触发
             handleInputConfirm(){
                  console.log("ok")
             },
             //点击按钮展示文本输入框
             showInput(row){
                row.inputVisible = true
                //让文本框自动获得焦点
                //$nextTick方法的作用就是当页面的元素被重新渲染后，才会执行回调函数的代码
                this.$nextTick(_ => {
                this.$refs.saveTagInput.$refs.input.focus();
                        });
             },
            async handleInputConfirm(row){
                 if(row.inputValue.trim().length===0){
                     row.inputValue=''
                      row.inputVisible=false
                      return
                 }
                   //如果没有return，则证明输入的内容需要后续处理
                   row.attr_vals.push(row.inputValue.trim())    
                   row.inputValue='';
                   row.inputVisible = false
                   //需要发起请求保存这次操作
                   this.savaAttrVals(row)
             },
             //将对attr_vals的操作保存到数据库
            async savaAttrVals(row){
                 const {data:res}  = await  this.$http.put(`categories/${this.cateID}/attributes/${row.attr_id}`,{attr_name:row.attr_name,attr_sel:this.activeName,attr_vals:row.attr_vals.join(',')})
                     if(res.meta.status!=200){
                         this.$message.error('修改参数项失败')
                     }
                      this.$message.success('修改参数项成功！')
             },
             //删除对应的参数可选项
               handleClose(i,row){
                 row.attr_vals.splice(i,1)
                 this.savaAttrVals(row)
             }
    },
    //计算属性
    computed:{
        //返回布尔值，如果按钮需要被禁用，返回true，否则返回false
         isBtnDisable(){
             if(this.selectedKeys.length!==3){
                 return true;
             }
             return false
                    },
        //当前选中的三级分类的id,作为参数放入请求路径进行请求数据，这时要用${}进行处理
        cateID(){
            if(this.selectedKeys.length==3){
                return this.selectedKeys[2];
            }
            return null
        },
        //动态计算标题的文本，用于适应对话框的变化
        dialogText(){
            if(this.activeName=='many'){
                return '动态参数'
            }
            return '静态属性'
        }
         
    }
}
</script>